entrance lock

entrance lock

[′en·trəns ‚läk]
(civil engineering)
A lock between the tideway and an enclosed basin made necessary because the levels of the two bodies of water vary; by means of this lock, vessels can pass either way at all states of the tide. Also known as guard lock; tidal lock; tide lock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Police said the perpetrators entered the enclosed area by cutting the entrance lock.
The entrance lock measures about 12 metres by 50 metres, and the dock covers about 5,000 square metres.
At the Blackwall end of the West India Dock, next to the old entrance lock is Cold-harbour, a narrow cobbled lane that runs parallel to the river and loops round to the later entrance lock in the South West India Dock.
Princess Elizabeth and Lieutenant Philip Mountbatten, aboard the Mersey Docks & Harbour Board's steam tender Galatea with two large loudspeakers perched on the bow, open Liverpool Docks' new Waterloo entrance lock on May 30, 1940
But first we had to pass through the canal's narrow-looking entrance lock - a delicate procedure for a ship which is 270m long and more than 32m wide.